I was working on my Grand Guildhouse applied Maple Timbers and noticed they would only apply at 3:1.
There is a 600 skill lvl req. and 800 optimal to apply. My current skill at the time was 1268, suited up some of my woodworking gear and skill was 1456. Timbers still would only apply at 3:1
I went to another structure and timbers would apply at 2:1
Had another person confirm that the GH would only apply at 3:1 no matter how much skill you had.
The was on the Chaos server- Harton Valley Grand Guild House.